Ultrasonic Absorption in Carbon Disulphide

Abstract

IN a report¹ which has just come to our notice, R. A. Rapuano describes results obtained for ultrasonic absorption in carbon disulphide in the frequency range 75–195 Mc./s., which are complementary to initial measurements made by us in the range 30–75 Mc./s. It is shown in the following that the combined results are not only consistent among themselves, but are also compatible with calculations based on the assumption that there is a relaxation of the transfer of energy to the degenerate bending vibration of the carbon disulphide molecule (fundamental frequency², ν₁ = 397 cm.⁻¹ (Table 1)). Measurements to be made in the near future on the temperature-dependence of the ultrasonic absorption over the whole frequency-range covering the dispersion will afford a direct check for this assumption.